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            "title": "Range Sum Query 2D - Immutable",
            "titleSlug": "range-sum-query-2d-immutable",
            "content": "<p>Given a 2D matrix <code>matrix</code>, handle multiple queries of the following type:</p>\n\n<ul>\n\t<li>Calculate the <strong>sum</strong> of the elements of <code>matrix</code> inside the rectangle defined by its <strong>upper left corner</strong> <code>(row1, col1)</code> and <strong>lower right corner</strong> <code>(row2, col2)</code>.</li>\n</ul>\n\n<p>Implement the NumMatrix class:</p>\n\n<ul>\n\t<li><code>NumMatrix(int[][] matrix)</code> Initializes the object with the integer matrix <code>matrix</code>.</li>\n\t<li><code>int sumRegion(int row1, int col1, int row2, int col2)</code> Returns the <strong>sum</strong> of the elements of <code>matrix</code> inside the rectangle defined by its <strong>upper left corner</strong> <code>(row1, col1)</code> and <strong>lower right corner</strong> <code>(row2, col2)</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/14/sum-grid.jpg\" style=\"width: 415px; height: 415px;\" />\n<pre>\n<strong>Input</strong>\n[&quot;NumMatrix&quot;, &quot;sumRegion&quot;, &quot;sumRegion&quot;, &quot;sumRegion&quot;]\n[[[[3, 0, 1, 4, 2], [5, 6, 3, 2, 1], [1, 2, 0, 1, 5], [4, 1, 0, 1, 7], [1, 0, 3, 0, 5]]], [2, 1, 4, 3], [1, 1, 2, 2], [1, 2, 2, 4]]\n<strong>Output</strong>\n[null, 8, 11, 12]\n\n<strong>Explanation</strong>\nNumMatrix numMatrix = new NumMatrix([[3, 0, 1, 4, 2], [5, 6, 3, 2, 1], [1, 2, 0, 1, 5], [4, 1, 0, 1, 7], [1, 0, 3, 0, 5]]);\nnumMatrix.sumRegion(2, 1, 4, 3); // return 8 (i.e sum of the red rectangle)\nnumMatrix.sumRegion(1, 1, 2, 2); // return 11 (i.e sum of the green rectangle)\nnumMatrix.sumRegion(1, 2, 2, 4); // return 12 (i.e sum of the blue rectangle)\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>m == matrix.length</code></li>\n\t<li><code>n == matrix[i].length</code></li>\n\t<li><code>1 &lt;= m, n &lt;= 200</code></li>\n\t<li><code>-10<sup>5</sup> &lt;= matrix[i][j] &lt;= 10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= row1 &lt;= row2 &lt; m</code></li>\n\t<li><code>0 &lt;= col1 &lt;= col2 &lt; n</code></li>\n\t<li>At most <code>10<sup>4</sup></code> calls will be made to <code>sumRegion</code>.</li>\n</ul>\n",
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                    "code": "class NumMatrix {\npublic:\n    NumMatrix(vector<vector<int>>& matrix) {\n        \n    }\n    \n    int sumRegion(int row1, int col1, int row2, int col2) {\n        \n    }\n};\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * NumMatrix* obj = new NumMatrix(matrix);\n * int param_1 = obj->sumRegion(row1,col1,row2,col2);\n */",
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                    "code": "class NumMatrix {\n\n    public NumMatrix(int[][] matrix) {\n        \n    }\n    \n    public int sumRegion(int row1, int col1, int row2, int col2) {\n        \n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * NumMatrix obj = new NumMatrix(matrix);\n * int param_1 = obj.sumRegion(row1,col1,row2,col2);\n */",
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                    "lang": "Python",
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                    "code": "class NumMatrix(object):\n\n    def __init__(self, matrix):\n        \"\"\"\n        :type matrix: List[List[int]]\n        \"\"\"\n        \n\n    def sumRegion(self, row1, col1, row2, col2):\n        \"\"\"\n        :type row1: int\n        :type col1: int\n        :type row2: int\n        :type col2: int\n        :rtype: int\n        \"\"\"\n        \n\n\n# Your NumMatrix object will be instantiated and called as such:\n# obj = NumMatrix(matrix)\n# param_1 = obj.sumRegion(row1,col1,row2,col2)",
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                    "code": "class NumMatrix:\n\n    def __init__(self, matrix: List[List[int]]):\n        \n\n    def sumRegion(self, row1: int, col1: int, row2: int, col2: int) -> int:\n        \n\n\n# Your NumMatrix object will be instantiated and called as such:\n# obj = NumMatrix(matrix)\n# param_1 = obj.sumRegion(row1,col1,row2,col2)",
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                    "code": "\n\n\ntypedef struct {\n    \n} NumMatrix;\n\n\nNumMatrix* numMatrixCreate(int** matrix, int matrixSize, int* matrixColSize) {\n    \n}\n\nint numMatrixSumRegion(NumMatrix* obj, int row1, int col1, int row2, int col2) {\n  \n}\n\nvoid numMatrixFree(NumMatrix* obj) {\n    \n}\n\n/**\n * Your NumMatrix struct will be instantiated and called as such:\n * NumMatrix* obj = numMatrixCreate(matrix, matrixSize, matrixColSize);\n * int param_1 = numMatrixSumRegion(obj, row1, col1, row2, col2);\n \n * numMatrixFree(obj);\n*/",
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                    "code": "public class NumMatrix {\n\n    public NumMatrix(int[][] matrix) {\n        \n    }\n    \n    public int SumRegion(int row1, int col1, int row2, int col2) {\n        \n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * NumMatrix obj = new NumMatrix(matrix);\n * int param_1 = obj.SumRegion(row1,col1,row2,col2);\n */",
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                    "code": "/**\n * @param {number[][]} matrix\n */\nvar NumMatrix = function(matrix) {\n    \n};\n\n/** \n * @param {number} row1 \n * @param {number} col1 \n * @param {number} row2 \n * @param {number} col2\n * @return {number}\n */\nNumMatrix.prototype.sumRegion = function(row1, col1, row2, col2) {\n    \n};\n\n/** \n * Your NumMatrix object will be instantiated and called as such:\n * var obj = new NumMatrix(matrix)\n * var param_1 = obj.sumRegion(row1,col1,row2,col2)\n */",
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                    "code": "class NumMatrix\n\n=begin\n    :type matrix: Integer[][]\n=end\n    def initialize(matrix)\n        \n    end\n\n\n=begin\n    :type row1: Integer\n    :type col1: Integer\n    :type row2: Integer\n    :type col2: Integer\n    :rtype: Integer\n=end\n    def sum_region(row1, col1, row2, col2)\n        \n    end\n\n\nend\n\n# Your NumMatrix object will be instantiated and called as such:\n# obj = NumMatrix.new(matrix)\n# param_1 = obj.sum_region(row1, col1, row2, col2)",
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                    "code": "\nclass NumMatrix {\n\n    init(_ matrix: [[Int]]) {\n        \n    }\n    \n    func sumRegion(_ row1: Int, _ col1: Int, _ row2: Int, _ col2: Int) -> Int {\n        \n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * let obj = NumMatrix(matrix)\n * let ret_1: Int = obj.sumRegion(row1, col1, row2, col2)\n */",
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                    "code": "type NumMatrix struct {\n    \n}\n\n\nfunc Constructor(matrix [][]int) NumMatrix {\n    \n}\n\n\nfunc (this *NumMatrix) SumRegion(row1 int, col1 int, row2 int, col2 int) int {\n    \n}\n\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * obj := Constructor(matrix);\n * param_1 := obj.SumRegion(row1,col1,row2,col2);\n */",
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                    "code": "class NumMatrix(_matrix: Array[Array[Int]]) {\n\n    def sumRegion(row1: Int, col1: Int, row2: Int, col2: Int): Int = {\n        \n    }\n\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * var obj = new NumMatrix(matrix)\n * var param_1 = obj.sumRegion(row1,col1,row2,col2)\n */",
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                    "code": "class NumMatrix(matrix: Array<IntArray>) {\n\n    fun sumRegion(row1: Int, col1: Int, row2: Int, col2: Int): Int {\n        \n    }\n\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * var obj = NumMatrix(matrix)\n * var param_1 = obj.sumRegion(row1,col1,row2,col2)\n */",
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                    "code": "struct NumMatrix {\n\n}\n\n\n/** \n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl NumMatrix {\n\n    fn new(matrix: Vec<Vec<i32>>) -> Self {\n        \n    }\n    \n    fn sum_region(&self, row1: i32, col1: i32, row2: i32, col2: i32) -> i32 {\n        \n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * let obj = NumMatrix::new(matrix);\n * let ret_1: i32 = obj.sum_region(row1, col1, row2, col2);\n */",
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                    "code": "class NumMatrix {\n    /**\n     * @param Integer[][] $matrix\n     */\n    function __construct($matrix) {\n        \n    }\n  \n    /**\n     * @param Integer $row1\n     * @param Integer $col1\n     * @param Integer $row2\n     * @param Integer $col2\n     * @return Integer\n     */\n    function sumRegion($row1, $col1, $row2, $col2) {\n        \n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * $obj = NumMatrix($matrix);\n * $ret_1 = $obj->sumRegion($row1, $col1, $row2, $col2);\n */",
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                    "code": "class NumMatrix {\n    constructor(matrix: number[][]) {\n\n    }\n\n    sumRegion(row1: number, col1: number, row2: number, col2: number): number {\n\n    }\n}\n\n/**\n * Your NumMatrix object will be instantiated and called as such:\n * var obj = new NumMatrix(matrix)\n * var param_1 = obj.sumRegion(row1,col1,row2,col2)\n */",
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                    "code": "defmodule NumMatrix do\n  @spec init_(matrix :: [[integer]]) :: any\n  def init_(matrix) do\n\n  end\n\n  @spec sum_region(row1 :: integer, col1 :: integer, row2 :: integer, col2 :: integer) :: integer\n  def sum_region(row1, col1, row2, col2) do\n\n  end\nend\n\n# Your functions will be called as such:\n# NumMatrix.init_(matrix)\n# param_1 = NumMatrix.sum_region(row1, col1, row2, col2)\n\n# NumMatrix.init_ will be called before every test case, in which you can do some necessary initializations.",
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    }
}